Making sheet-metal hoops.



MARN@ ,SHEET-METAL HOOPS. I

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Speeioation of Letters latent.

Patented July 23'?, laila.

Application led'lnly 16, i914. Serial No. 851,330.

To all lwhom it may concern from a straight-strip of sheet nietal lar cross section a hoopihaving opposite sub- Fig. 5. r:the rollers a-a are so forme V and thev connecting web is lthe straight strip hoop complete,

planes,

at right angles or thereabout thereto. and' portion of the flange v1 than to the inn p f Be it known that l', EDWARD W. ROBINSON, a citizen of lthellnited States, residing in Savannah, Georgia, `,have invented certain Improvements inv Making ySheet-lli/letal Hoops, of which thefollowiifig is a specification.

One object of my, invention is to produce of angustantially parallel annular side 'flanges with aweb connecting adjacent edges of the saine, further object being to produce such a the inner flange of the hoop. 'These objects l attain in the manner hereinafter set forth, yreference being had to the accompanying drawings, in which Figure 1 is a sectional view illustrating v`one ofthe purposes for which my improved hoopinay be used; Fig. 2

lis a view of the prelierred foi-in of straight snip from which the .hoop is produced; Fig, 3 is a perspective View of th'e sainevafter being bei'it into ring form; Fig. i isa/perspective view of the except as to/ the joining of the ends of the saine, Fig 5 isa diagram representing the first step in the formation of the hoop from 'the strip Fig. 6 is a diagram representing the first step in the comletion of the hoopgFiga 7' isf a diagram illustrating a further step, and Fig. 8 is a diagram illustrating the llnal step.

ln carrying out my inventionr lrst prepare a straight sheetmetal strip such as shown inFig. 1, said stripupresenting opposite edge portions and. 9v in parallel and a connecting portion 3 in a plane this' strip is then subjectedto the action" of rollersI a--a and- ?2, the rollers'a-o, acting upon. opposite sides y.of the flange 1 and the roller L bearing against the inner face ofthe Harige 3 and'pressing said ilange' against the flat faces of therollers a-, as'shown in as to impart greater pressure to -tion of the same, thereby longitudinally spreading or Emp-aridiA the outer portion of said flange 1. The result of this action is :that the liianges 1 and 2 are bent edgewise bent.- sidewise, fed to the rollers a-a being delivered thereby in curved form and nally assuming the condition of a split -the die d may ring, as shown in FigfQ, the flange Zbeingy puclrered or. wrinkled at its inner edge owing 'to the contraction in the `diameter of said inner edge as compared with the diameter of the flange 3, which retains its original condition, not having been. subjected either to expansion orrcontrac'tion, in any of its parts, but having been bent flatwise or transversely to its original plane instead of edgewise or in suclivoriginal plane,

'as is the case with the flanges 1 and SQ rlhe ring shown in Fig. 2 is then su iected to the action of circular dies o, d, e and f, each of which may be in 'the form of a continuousy ring or may be made in as many di'erent' pieces or sections as is found desirable. The die c has upper, side and llower faces for contact, respectively, with ythe flanges 1, 3 and 2 of thewring and the dies al, e and 7 are movable vertically in respectto the die c. The die al presses the wrinkled or corrugated flange 3 against the lower face of the die o so as to llatten out said wrinkles or corriigations,`as shown in Fig. 6.

The diev e clamps upon the upper face of the die c that portion 1a of the flangel which is adjacent to the flange 3, and the die f bends down alongside of the die c the outer projecting portion of said flange 1 so' as to produce the depending outer flange 1b of the hoop, as shownin Figs. 7 and 8. As the projecting portion of the Iflange 1 is bent downwardly over the die o to form. the flange 1b., the lower portion of said flange is puclrered or wrinkled, as shown in Fig. 7, because of the reduction in the diameter of the same as compared with the diameter# flange' 1', but as "if shown in Fig. l

3 hasvbeenv produced, the hoop is completed4 by uniting the opposite ends 5-5, by weld- I l0@ disconnected,I and v ing, brazing, riveting, or` equivalent means, or these ends may remain may be retained inproper relation to veach other by nailing or otherineans after the hoophas been applied. 'p l nfcarrying out iny invention the use 'of beornitted and the headretaining flange 2 permitted to retain its wrinkled or corrugated outer edge, ify 'desired, or this flange 2 may .be omitted al-y together in soine cases and instead ofv continuing the movement of the die: f until-it has latteiied'v the wrinkles` at and near the ing one of these flanges to greater pressure l at and near the free edge' than at and near its junction with the other flange, and thus causing the first 'named flange -to spread or expand longitudinally at and near said free edge and thereby simultaneously bend said flange edgeivise and the other flange flatwise intoa ring segment.

2. The mode herein described of preparing a blank for a hoop segment, said mode consisting in first preparing a straight strip of sheet metal having opposite edge flanges in A separate planes parallel with each other, and

a connecting web in a plane substantially at right angles to said edge flanges, and

then subjecting one of said edge flanges to v greater pressure at and near its free edge than at and near its junction with the connectingweb and thus causing said flange at.

and near its free edge to spread or expand longitudinally and thereby cause simultaneous bending of both edge fla ges edgewise and lof the connectingvveb atvvise into va ring segment.

3. The mode herein described of producing a hoop segment, said mode consisting in first preparing a straight strip of sheet metal having flanges' at right angles or thereabout to one another, then bending one of said flanges edgewise and the other flatwise into a ring segment, and then subjecting the latter to the action 'of a die whereby the edgewise bent flange has its free edge portion bent to form a flangesubstan- -tially parallel with the flatWise bent flange.

Ll. The mode herein described of producing said mode consisting in first preparing a straight strip of sheet metal having flanges at right angles or thereabout to one another.,l then bending one of' said flanges edgeivise and the other flativise into a ring segment, then subjecting the latter to the action of a die whereby the edgewise bentflange has its free edge portion parallel with the flatwise bent flange, and after they bending operation has been completed, continuing the action of said die so as to flatten any Wrinkles or corrugations Which may have been formed atand near the free edge of the flange by the preliminary bending action.

a hoop segment,

5. The mode herein described of producing bent to form a flange substantiallyabout "zo said edge flanges, then bending said parallel edge flanges edgewise and said intervening web flatwlise into a ring segment, and then subjecting the outer flange of the latter to the action of a die whereby the portion of said flange at and near its free edge is bent to form a flange substantially parallel with the connecting Web.

6. The mode herein described of producing a hoop segment, said mode consisting 'in first preparing a straight Strip of sheet metal having opposite edge flanges in separate parallel planes, and an intervening connecting Web in a plane at right angles or thereabout to said edge flanges, then bending vsaid paralleledge flanges edgewiseand said intervening Web flatwise into a ring segment, then subjecting the outer flange of the latter to the action of a die Wherebythe portion of said flange at and near its free edge is bent to form a flange substantially parallel with the connecting web, and, at-the salne time, imparting pressure to the opposite edge flange so as to flatten any Wrinkles er corrugations which may have beenvformed therein by the edge bending ef the same.

7.V The mode herein descrlbed of producing a hoop segment, said mode consisting in fi'rst preparing a straight strip of sheet metal having opposite edge fianges in separate parallel planes, and an intervening connectingl Web in a plane at right angles or thereabout tosaid edge flanges, then bending said parallel edge flanges edgewise and said intervening Web flatwise into a ring segment, then subjecting the outer flange of the latter to the action of a die whereby the portion of said flange at and near its free edge is bent to form a flange substantially parallel Withthe connecting web, and, at the same time, imparting pressure to the opposite edge flange of the ring so as to flatten KATE A. Bia-mm1, HAMILTON D. TURNER.

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